git-bisect.sh: don't accidentally override existing branch "bisect"

diff --git a/t/t6120-describe.sh b/t/t6120-describe.sh
index cc24477668b807bc38ace346094d788ac1080bbc..56bbd8519d69a1fc31293f30eb3c8a7b20a285cc 100755 (executable)
--- a/t/t6120-describe.sh
+++ b/t/t6120-describe.sh
@@ -15,8 +15,9 @@ test_description='test describe
 check_describe () {
        expect="$1"
        shift
-       R=$(git describe "$@")
+       R=$(git describe "$@" 2>err.actual)
        S=$?
+       cat err.actual >&3
        test_expect_success "describe $*" '
        test $S = 0 &&
        case "$R" in
@@ -97,6 +98,21 @@ check_describe A-* --tags HEAD^^2
 check_describe B --tags HEAD^^2^
 
 check_describe B-0-* --long HEAD^^2^
+check_describe A-3-* --long HEAD^^2
+
+test_expect_success 'rename tag A to Q locally' '
+       mv .git/refs/tags/A .git/refs/tags/Q
+'
+cat - >err.expect <<EOF
+warning: tag 'A' is really 'Q' here
+EOF
+check_describe A-* HEAD
+test_expect_success 'warning was displayed for Q' '
+       git diff err.expect err.actual
+'
+test_expect_success 'rename tag Q back to A' '
+       mv .git/refs/tags/Q .git/refs/tags/A
+'
 
 test_expect_success 'pack tag refs' 'git pack-refs'
 check_describe A-* HEAD